#!/usr/bin/env node
const http=require('http'),
      url=require('url'),
      qs=require('querystring');
      //log=console.log;
let items=[];
function genPage(){
  let html=`<!DOCTYPE html>
  <html lang="en">
    <head>
      <meta charset="UTF-8">
      <title>TodoList </title>
    </head>
    <body>
      <h1>TodoList</h1>
      <form method='GET' action="http://192.168.194.144:8080">           
        <input type="text" name="item">              
        <input type="submit" value="submit">                                              
      </form>  
      <ul id="items">
      ${items.map(i=>'<li>'+i+'</li>').join('\n')} 
      </ul>
  </body>
  </html>`;
  return html;
}
http.createServer((req,res)=>{
  let addr=url.parse(req.url);
  if(addr.pathname!=='/'){
    res.statusCode=404;
    res.setHeader('conten-type','text/html');
    res.end('<h1>Not Found</h1>');
    return;
  }
  let item=qs.parse(addr.query).item;
  if(item!=='' && typeof item!=='undefined'){
    items.push(item);
  }
  res.writeHead(200,{
    'content-type':'text/html',
    'content-length':Buffer.byteLength(genPage())
  });
  res.end(genPage());
}).listen(8080);
